[Bug 996151] Re: disable apt http pipelining in quantal

[Sandip Bhattacharya]

Since it is just a config change, can this fix be enabled in Precise,
since it an LTS after all. We are trying to install Precise in our org,
and our squid proxies are preventing us from using the latest LTS
because of this bug.

If however, there is a way to disable pipelining in a preseed file, that
would work as well as a workaround.

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https://bugs.launchpad.net/bugs/996151

Title:
  disable apt http pipelining in quantal

Status in “apt” package in Ubuntu:
  Fix Released
Status in “apt” package in Debian:
  New

Bug description:
  Per UDS session on Apt improvements, it has been proposed to remove
  apt http pipelining

  The reasons:
  1. HTTP Pipelining has issue with certain proxy implementation
  2. Some new object stores, like S3, or Google's APT repositories have problems with HTTP Pipelining

  Running a test shows that disabling apt-pipelining has no perceptable
  diffferenvce, and disabling apt pipeling actually performed slightly
  better with an average of 31.899s versuses 32.456s. I tested an "apt-
  get -y update" with and without apt HTTP pipelining turned on.

  For more information on apt-pipelining, here are 2 threads to read:
   http://old.nabble.com/APT-do-not-work-with-Squid-as-a-proxy-because-of-pipelining-default-td28579596.html
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=565555

  
  Pipelining on (apt-get -y upgrade):
  33.92
  31.37
  31.64
  31.63
  33.29
  33.08
  32.92
  32.88
  31.73
  31.98
  32.01
  32.96
  31.51
  32.68
  33.25

  Pipelining off (apt-get -o Acquire::http::Pipeline-Depth="0" -y upgrade):
  31.66
  31.59
  31.24
  31.30
  31.29
  32.85
  32.75
  31.50
  31.18
  32.26
  31.43
  33.28
  31.67
  32.45
  32.04

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